Improvement in adjustable bevels



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LEONARD D. Howlinnor s'rxJoHNsBUuY. VERMONT.

Letters Patent No. 111,746, dated February 14, 1871.

IMPROVEMENT IN ADJUSTABLE BEvELs.

The Schedule referred to in these Letter: Patent and making part of the same.

I, LEONARD D. HOWARD, ot' St. J ohnsbury, vCaledonia county, Vermont, have invented certain Improvementsvin Bevels, of which the following is a specification.

Figurev 1 is aplan View;

Figure 2 is a longitudinal vertical section; and

Figure 3 is a transverse vertical section This invention relates to the means whereby the l two arms of a bevel are connected in suchvmanner that they may be readily tightened or loosened, as

may be necessary, in order to the adjustment of thel arms at any desired angle with cach. other.

Referring to the V'drawing- The main arm of a bevel is shown as constructed iu-two separate longitudinal sections, a a', the same being hollow, and one of them being recessed at its sides -and at one end so as, when .the two sections are .pnt together, to form a slot in the main arm for the reception of the blade b through the slot c of which Vpasses a set-screw, d, that enters a socket, `e, which is cast within the section a near its rounded end, by means of which set-screw and socket the blade b is connected with the section a. A

The head ofthe ,section a' is cast solid, with the exception of a central recess justwide enoughfto'ad- `mit the head of th'e screw d.

c .From the lowei corners of the two solid parts-of the head Bauges t', inward toward each other, so far as ,to leave an interval of only sucientwidth for the reception of the shank of the screw d.

. Hence, when thel headof the section ais drawn over y the screw d so that the head of latter is in the central recess of the former and the'anges @are under the head ofthe screw, the two sections a a are fastened tgether at one end, the blade being between them.

In order to tighten the sections upon the blade the flanges v1 2 are .made slanting on their upper sides upward from their corners toward the end of the section, and the head of vthe screw d isjset at a corresponding slant and, as the inclined anges pass under the head o f the screw, they draw the heads of the two sections together until they clamp the blade between them as tightly as desired.

The means for drawing the anges t under the head of the' screw d are:

First, a set-screw, f, placed in a dovetail block, g," that'extends upward from the butt of the section a, transversely of the latter and parallel with the four-'sides of -the main arm, which setscrew is furnished with anges rngthat .inclose the block g between them, abutting upon it at each side, said screw extending a suitable 'distance within the section a, and having a head, f', that projects toa .suitable outside of said section;

' Second, a lug, h, cast within and with the section a' and provided with a transverse-threaded orifice oi' proper size to receive the screw j, the lug being long enough to-admit of the screw entering the orifice.

When the screw is therein entered, by-turning it backward or forward the vsection 'a' is 'drawn in the corresponding direction along the section a.

At the butt of the former is a transverse recess of shape and size suited to receive the block g, there being a central groove that runs crosswise ot'said butt for the reception of' the collars an.

When, therefore, the section a' is drawn, by the means described, so far along the section a that the block g enters the groove above mentioned, the two sections are thereby fastened together at the butt and thus their connection isrendered complete, and this, it will 'be .9bserved,\vithout the use voi' any other screws except d and f, so that there are no perfora-4 tions in the outside ot'nthe main arm of the bevel, and

it therefore presents an unbroken eirterior.

I claim asmy invention-- 1.` The inclined iiang'es tot the section a', in comt bination with the inclined screw-headdof the section a, as described.

2. The section a, provided with the dovetail block y and screw f, in combination with the section a', provided with a groove atits butt corresponding to the dovetail block and with the lug h, as set forth.

f LEONARD DI. LHOWARD Witnesses:

A. G. CHADWICK,

A. M. OHADWIOK. 

